Research Concepts RC2500 - Manual (Page 120)

RC2500 Antenna Controller Appendix K Driving 36VDC Motors 113
Research Concepts, Inc. • 5420 Martindale Road • Shawnee, Kansas 66218-9680 • USA www.researchconcepts.com
2.1 Smart Booster Modifications
Remove the following components: R32, C3, C4, V1, V2
Replace the following components …
Component Replace With …
R5 Jumper
R6, R7, R8 2600 ohm, 1 watt resistor. Alternatively, a second 1300 ohm,
0.5 watt resister can be added in series with the existing 1300
ohm, 0.5 watt resister.
U6 (PLD –
programmable logic
device)
Replace the standard PLD (BOOST4) with the BOOST5 PLD.
Install the following components …
Component Description
D12 1N4002
K3 G6H-2-12VDC relay (10 pin DIP). Use a 14 pin socket with 4
pins removed.
R31 2000 ohm, ¼ watt resistor
Make the following modifications to the board (see the circuit board bottom trace mask) …
1. Near IC3, cut two traces and install two jumpers.
2. Install a 1300 ohm, 0.5 watt resistor between J2-5 and J3-4. Use heat shrink tubing to prevent
shorts.
3. Install a 16 AWG jumper between J3-2 and the large via in the trace connected to J2-2.
2.2 Smart Booster I/O
The following table describes the input and output characteristics of the modified Smart Booster.
J2 Terminal Description
J2-1 No Connect
J2-2 Alarm Status Output, 24 VDC => No Alarm, Float => Over-
current Alarm Active
J2-3 Motor Drive Output
J2-4 Motor Drive Output
J2-5 24 VDC Input
J2-6 Az Ccw/El Down Input. Pull to ground to activate drive.
Internally tied to 24 VDC through 2600 ohm in series with an
opto-coupler photo diode.
J2-7 Az Cw/El Up Input. . Pull to ground to activate drive.
Internally tied to 24 VDC through 2600 ohm in series with an